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ADS1247IPWR
Low Noise, Precision 24-Bit Analog-to-Digital Converter
Burnout
Detect
3rd Order
Modulator
AVDD REFP1 REFN1 DVDD
ADS1247
ADS1248SCLK
DIN
DRDY
DOUT/DRDY
START
Input
Mux
VBIAS
PGA
Serial
Interface
And
Control
AIN2/IEXC/GPIO2
AIN3/IEXC/GPIO3
AIN4/IEXC/GPIO4
AIN5/IEXC/GPIO5
REFP0/
GPIO0
REFN0/
GPIO1
VREF Mux Voltage
Reference
System
VREFOUT VREFCOM
ADS1248 Only REFN DVDD
ADS1246SCLK
DIN
DRDY
DOUT/DRDY
START
Serial
Interface
And
Control
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Design
ADS1246, ADS1247, ADS1248SBAS426H –AUGUST 2008–REVISED MARCH 2016
ADS124x 24-Bit, 2-kSPS, Analog-To-Digital Converters With
Programmable Gain Amplifier (PGA) For Sensor Measurement Features Programmable Data Rates Upto2 kSPS Single-Cycle Settling forAll Data Rates Simultaneous 50-Hz and 60-Hz Rejectionat20
SPS Analog Multiplexer With8 (ADS1248) and4
(ADS1247) Independently Selectable Inputs Low-Noise PGA:48 nVRMSat PGA= 128 Dual-Matched Programmable Excitation Current
Sources Low-Drift Internal 2.048-V Reference: ppm/°C (Maximum) Sensor Burn-Out Detection 4or8 General-Purpose I/Os (ADS1247,
ADS1248) Internal Temperature Sensor Power Supply and VREF Monitoring (ADS1247,
ADS1248) Self and System Calibration SPI™-Compatible Serial Interface Analog Supply: Unipolar (2.7Vto 5.25V) and
Bipolar (±2.5V) Operation Digital Supply: 2.7Vto 5.25V
Applications Temperature Sensor Measurements: RTDs, Thermocouples, and Thermistors Pressure Measurements Flow Meters Factory Automation and Process Controls
DescriptionThe ADS1246, ADS1247, and ADS1248 devices are
precision, 24-bit analog-to-digital converters (ADCs)
that include many integrated features to reduce
system cost and component count for sensor
measurement applications. The devices featurea
low-noise, programmable gain amplifier (PGA),a
precision delta-sigma (ΔΣ) ADC witha single-cycle
settling digital filter, and an internal oscillator. The
ADS1247 and ADS1248 devices also providea built-
in, low-drift voltage reference, and two matched
programmable excitation current sources (IDACs). input multiplexer supports four differential inputs
for the ADS1248, two for the ADS1247, and one for
the ADS1246.In addition, the multiplexer integrates
sensor burn-out detection, voltage bias for
thermocouples, system monitoring, and general
purpose digital I/Os (ADS1247 and ADS1248). The
PGA provides selectable gains upto 128 V/V. These
features providea complete front-end solution for
temperature sensor measurement applications
including thermocouples, thermistors, and resistance
temperature detectors (RTDs) and other small signal
measurements including resistive bridge sensors.
The digital filter settlesina single cycleto support
fast channel cycling when using the input multiplexer
and provides data ratesupto2 kSPS. For data rates20 SPSor less, both 50-Hz and 60-Hz interference
are rejectedby the filter.
Device Information(1)(1) Forall available packages, see the orderable addendumat
the endofthe datasheet.
Simplified Schematic
